研究报告
王功芹,朱珠,张硕.海州湾表层沉积物中氮的赋存形态及其生态意义[J].环境科学学报,2016,36(2):450-457
海州湾表层沉积物中氮的赋存形态及其生态意义
- Nitrogen forms in the surface sediment of Haizhou Bay and their ecological significance
- 基金项目：农业部转产转业项目-江苏省海州湾海洋牧场示范项目(No.D-8006-13-8023,D8006-12-8018);国家公益性行业(农业)科研专项(No.201003068)
- 作者
- 单位
- 王功芹
- 上海海洋大学海洋科学学院, 上海 201306
- 朱珠
- 上海海洋大学海洋科学学院, 上海 201306
- 张硕
- 1. 上海海洋大学海洋科学学院, 上海 201306;2. 大洋渔业资源可持续开发省部共建教育部重点实验室, 上海 201306;3. 国家远洋渔业工程技术研究中心, 上海 201306
- 摘要：于2014年10月在海州湾采集表层沉积物,利用分级浸取分离的方法,对其中的离子交换态氮(IEF-N)、弱酸可浸取态氮(WAEF-N)、强碱可浸取态氮(SAEF-N)及强氧化剂可浸取态氮(SOEF-N)4种可转化态氮(TTN)的含量进行了分析测定,结合沉积物的有机质含量(TOC)、粒度分布,讨论了各形态氮的生态意义.结果表明:IEF-N、WAEF-N、SAEF-N、SOEF-N、非转化态氮(NTN)、总氮(TN)的平均含量分别为12.63、5.78、8.93、85.32、568.93和681.59 mg·kg-1;各形态氮在TTN中所占的比例大小顺序为SOEF-N(75.73%)> IEF-N(11.21%)> SAEF-N(7.93%)> WAEF-N(5.13%).研究还表明,沉积物中TN与TOC和粒径具有显著的相关性(p<0.01);WAEF-N与TOC具有显著的相关性(p<0.01),与粒径也具有显著相关性(p<0.05),其他形态氮与TOC、粒度分布均有一定程度的相关关系;各形态氮与水体中的溶解态无机氮(DIN)、叶绿素a具有相关性,说明沉积物中的氮对海洋生态环境有着重要意义.
- Abstract：The sequential extracted surface sediment samples collected from Haizhou Bay in October 2014 were analyzed to determine different forms of nitrogen, including ion exchangeable form-nitrogen (IEF-N), weak acid extractable form-nitrogen (WAEF-N), strong alkaline extractable form-nitrogen (SAEF-N) and strong oxidant extractable form-nitrogen (SOEF-N), along with total organic content (TOC) and particle size distribution. The ecological significance of different forms of nitrogen was also discussed. The results show that the mean concentrations of IEF-N, WAEF-N, SAEF-N, SOEF-N, nontransferable nitrogen (NTN), total nitrogen (TN) were 12.63 mg·kg-1, 5.78 mg·kg-1, 8.93 mg·kg-1, 85.32 mg·kg-1, 568.93 mg·kg-1 and 681.59 mg·kg-1, respectively. The percentage and order of the different forms of TTN was as follows: SOEF-N (75.73%)> IEF-N (11.21%)> SAEF-N (7.93%)> WAEF-N (5.13%). The study also show that the TN and TOC are significantly correlated to particle size (p<0.01), while other forms of TTN are associated with dissolved inorganic nitrogen and chlorophyll-a in water, which means the nitrogen in surface sediments have essential biogeochemical significance.
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